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Old 01-28-2013, 01:31 PM   #20
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Join Date: Mar 2012
Location: Estonia
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My Ride: 2002 BMW 325Ci
Originally Posted by E46Mango View Post
Somewhat true but bolt on gains don't help all that much. 330/s52 share same crankshaft, connecting rods, pistons.

you still have to worry about oil pump nut.
That's not totally true. "bolt ons" can do quite a bit for an M3 motor, they just aren't cheap bolt on's like you'd find for a Chevy or a Honda.

An m3 motor can gain 40-50 HP from, a better tune, upgraded cams, high quality headers and an upgraded exhaust without the cats. That still costs pretty big $$$ though for fairly modest gains.
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